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Parameter Sensitivity in Hydrologic Modeling - page 35 / 163

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In some cases the digital data in the form of DEMs must be edited to reduce the error that occurs from building and road features that are captured in the DEM. Barrett (2000) used a 30 foot grid created from a TIN to help resolve the difference in elevation of roads and bridges from the surrounding terrain, as these features act as dams when performing flow accumulation. The initial grid was also edited manually to improve the stream representation by creating openings in the dams, roads and bridges.

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